Determination of jurisdiction and venue are important considerations in any personal injury lawsuit. It's not always a straightforward issue, particularly if litigants are from different states or there is a question of federal law.
For the most part, injury lawsuits stemming from car accidents and truck accidents are going to fall under the purview of state courts. However, a court has to have personal and/or subject matter jurisdiction before it can hear a case. That means either the defendant resides in that district or it is the judicial district in which a substantial part of the events or omissions that gave rise to the claim occurred.
If a lawsuit is filed in the wrong venue, the court will likely dismiss the case without prejudice, meaning you can file again. Sometimes, the court will transfer the case to the proper district, but only if it's "in the interest of justice." However, if the case is dismissed, the time spent in the wrong court consumes valuable time that could count against you in terms of the statute of limitations on your case.